:root {
  --bg-dark: #0f172a;
  --bg-light: #ffffff;
  --text-primary: #0b1120;
  --text-muted: #64748b;
  --accent: #f97316;
  --accent-dark: #ea580c;
  --neutral-100: #f8fafc;
  --neutral-200: #e2e8f0;
  --neutral-900: #111827;
  font-size: 16px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', 'Noto Sans SC', sans-serif;
  background-color: var(--neutral-100);
  color: var(--text-primary);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(248, 250, 252, 0.9);
  border-bottom: 1px solid rgba(226, 232, 240, 0.7);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 0;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-weight: 600;
  color: var(--neutral-900);
}

.brand-logo {
  width: 62px;
  height: auto;
  border-radius: 0.6rem;
  box-shadow: 0 12px 18px rgba(15, 23, 42, 0.18);
}

.brand-mark {
  font-size: 1.2rem;
  letter-spacing: 0.12em;
}

.brand-tagline {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--text-muted);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-weight: 500;
}

.main-nav a {
  position: relative;
  padding-bottom: 0.2rem;
}

.main-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -0.3rem;
  width: 100%;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.main-nav a:hover::after,
.main-nav a:focus-visible::after {
  transform: scaleX(1);
}

.language-toggle {
  --thumb-offset: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin-left: 0.25rem;
  padding: 0.35rem 0.6rem;
  border: none;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.18);
  color: var(--text-muted);
  font: inherit;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color 0.25s ease, background 0.25s ease, box-shadow 0.25s ease;
}

.language-toggle:hover,
.language-toggle:focus-visible {
  background: rgba(255, 255, 255, 0.68);
  color: var(--text-primary);
  box-shadow: 0 12px 26px rgba(15, 23, 42, 0.14);
  outline: none;
}

.language-toggle:focus-visible {
  box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.22), 0 10px 24px rgba(15, 23, 42, 0.18);
}

.language-toggle:active {
  box-shadow: 0 6px 18px rgba(15, 23, 42, 0.16);
}

.language-toggle.is-current-zh {
  --thumb-offset: 1.6rem;
  color: var(--accent);
  background: rgba(249, 115, 22, 0.16);
}

.language-toggle__track {
  position: relative;
  width: 3.2rem;
  height: 1.6rem;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(148, 163, 184, 0.35), rgba(148, 163, 184, 0.15));
  border: 1px solid rgba(148, 163, 184, 0.45);
  box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.08), 0 2px 4px rgba(15, 23, 42, 0.08);
  transition: background 0.25s ease, border-color 0.25s ease;
}

.language-toggle__thumb {
  position: absolute;
  top: 0.12rem;
  left: 0.12rem;
  width: 1.36rem;
  height: 1.36rem;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #fff, #e2e8f0);
  box-shadow: 0 6px 16px rgba(15, 23, 42, 0.18);
  display: flex;
  align-items: center;
  justify-content: center;
  transform: translateX(var(--thumb-offset));
  transition: transform 0.25s ease, background 0.25s ease, box-shadow 0.25s ease;
}

.language-toggle__glyph {
  width: 0.95rem;
  height: 0.95rem;
  fill: #475569;
  transition: transform 0.25s ease, fill 0.25s ease;
}

.language-toggle:hover .language-toggle__glyph,
.language-toggle:focus-visible .language-toggle__glyph {
  transform: rotate(-8deg);
}

.language-toggle:hover .language-toggle__track,
.language-toggle:focus-visible .language-toggle__track {
  background: linear-gradient(135deg, rgba(148, 163, 184, 0.45), rgba(148, 163, 184, 0.2));
}

.language-toggle:hover .language-toggle__thumb,
.language-toggle:focus-visible .language-toggle__thumb {
  box-shadow: 0 10px 20px rgba(15, 23, 42, 0.22);
}

.language-toggle.is-current-zh .language-toggle__track {
  background: linear-gradient(135deg, rgba(249, 115, 22, 0.35), rgba(249, 115, 22, 0.2));
  border-color: rgba(249, 115, 22, 0.45);
}

.language-toggle.is-current-zh:hover .language-toggle__track,
.language-toggle.is-current-zh:focus-visible .language-toggle__track {
  background: linear-gradient(135deg, rgba(249, 115, 22, 0.45), rgba(249, 115, 22, 0.28));
}

.language-toggle.is-current-zh .language-toggle__thumb {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  box-shadow: 0 8px 18px rgba(249, 115, 22, 0.28);
}

.language-toggle.is-current-zh .language-toggle__glyph {
  fill: #fff;
}

.language-toggle__label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1;
  color: inherit;
  transition: color 0.25s ease;
}

.hero {
  position: relative;
  background: #0b1120 url("https://afar.brightspotcdn.com/dims4/default/b83c00e/2147483647/strip/true/crop/2000x1061+0+132/resize/2880x1528!/format/webp/quality/90/?url=https%3A%2F%2Fk3-prod-afar-media.s3.us-west-2.amazonaws.com%2Fbrightspot%2F92%2F8c%2Fd4930cc42bfdd35bb4d287cfa2e8%2Foriginal-banff-lake-louise-canada.jpg") center/cover no-repeat;
  color: #f8fafc;
  padding: 6rem 0 5rem;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, rgba(15, 23, 42, 0.85) 0%, rgba(16, 24, 40, 0.72) 40%, rgba(8, 46, 73, 0.6) 100%);
  backdrop-filter: blur(1.5px);
  z-index: 0;
}

.hero-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2.5rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: clamp(2.4rem, 4vw, 3.4rem);
  margin: 0 0 1.2rem;
  line-height: 1.1;
}

.hero p {
  margin: 0 0 2rem;
  color: rgba(241, 245, 249, 0.85);
}

.hero-highlights {
  margin: 0 0 2rem;
  padding-left: 1.2rem;
  color: rgba(241, 245, 249, 0.9);
  list-style: disc;
}

.hero-highlights li + li {
  margin-top: 0.4rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.8rem;
  border-radius: 999px;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 14px 30px rgba(249, 115, 22, 0.28);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  transform: translateY(-2px);
  background: var(--accent-dark);
  box-shadow: 0 16px 32px rgba(234, 88, 12, 0.35);
}

.btn-secondary {
  border: 1px solid rgba(248, 250, 252, 0.6);
  color: #f8fafc;
  background: transparent;
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  border-color: #fff;
  transform: translateY(-2px);
}

.hero-card {
  background: rgba(15, 23, 42, 0.35);
  border: 1px solid rgba(148, 163, 184, 0.25);
  border-radius: 1.2rem;
  padding: 2rem;
  backdrop-filter: blur(10px);
  box-shadow: 0 16px 40px rgba(8, 47, 73, 0.35);
}

.hero-card h2 {
  margin: 0 0 1rem;
  font-size: 1.3rem;
}

.hero-card p {
  margin: 0 0 1.5rem;
  color: rgba(226, 232, 240, 0.88);
}

.hero-link {
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--accent);
}

.section {
  padding: 4.5rem 0;
}

.section-header {
  text-align: center;
  margin-bottom: 2.8rem;
}

.section-header h2 {
  margin: 0 0 0.8rem;
  font-size: clamp(2rem, 3vw, 2.6rem);
}

.section-header p {
  margin: 0 auto;
  max-width: 28rem;
  color: var(--text-muted);
}

.mission-grid {
  display: grid;
  gap: 1.8rem;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.card {
  background: var(--bg-light);
  border-radius: 1.2rem;
  padding: 2rem;
  box-shadow: 0 18px 30px rgba(15, 23, 42, 0.08);
  border: 1px solid rgba(226, 232, 240, 0.7);
}

.card h3 {
  margin-top: 0;
  margin-bottom: 0.9rem;
  font-size: 1.2rem;
  color: var(--neutral-900);
}

.card p {
  margin: 0;
  color: var(--text-muted);
}

.program-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.program-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: #fff;
  padding: 1.6rem;
  border-radius: 1.1rem;
  border: 1px solid rgba(226, 232, 240, 0.7);
  box-shadow: 0 16px 28px rgba(15, 23, 42, 0.08);
}

.program-icon {
  width: 3.4rem;
  height: 3.4rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(249, 115, 22, 0.1);
  font-size: 1.6rem;
}

.impact {
  background: var(--bg-dark);
  color: #f8fafc;
}

.impact-wrapper {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  align-items: center;
}

.impact-copy h2 {
  font-size: clamp(2rem, 3vw, 2.6rem);
  margin: 0 0 1rem;
}

.impact-metrics {
  display: grid;
  gap: 1.4rem;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

.metric {
  background: rgba(148, 163, 184, 0.1);
  border-radius: 1.1rem;
  padding: 1.6rem;
  text-align: center;
  border: 1px solid rgba(148, 163, 184, 0.2);
}

.metric-value {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  color: #fbbf24;
}

.metric-label {
  display: block;
  font-weight: 500;
  color: rgba(226, 232, 240, 0.85);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.8rem;
}

.facebook {
  background: #f1f5f9;
}

.facebook-feed {
  display: block;
  max-width: 100%;
}

.facebook-feed iframe {
  width: 100%;
  max-width: 100%;
  border-radius: 1rem;
  box-shadow: 0 24px 40px rgba(15, 23, 42, 0.12);
  background: #fff;
}

.callout {
  background: radial-gradient(circle at center, rgba(249, 115, 22, 0.12), transparent 55%), #fff;
  text-align: center;
}

.callout-wrapper {
  padding: 3.5rem 2rem;
  background: #fff;
  border-radius: 1.5rem;
  border: 1px solid rgba(226, 232, 240, 0.7);
  box-shadow: 0 24px 40px rgba(15, 23, 42, 0.12);
}

.callout h2 {
  margin: 0 0 1rem;
  font-size: clamp(2.1rem, 3vw, 2.6rem);
}

.callout p {
  margin: 0 0 1.5rem;
  color: var(--text-muted);
}

.site-footer {
  background: var(--neutral-900);
  color: rgba(226, 232, 240, 0.9);
  padding: 3rem 0 2rem;
}

.footer-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.footer-grid h3 {
  margin-top: 0;
  color: #fff;
  font-size: 1.1rem;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.6rem;
}

.footer-links a {
  color: rgba(226, 232, 240, 0.8);
}

.footer-links a:hover {
  color: #fff;
}

.newsletter-form {
  display: grid;
  gap: 0.6rem;
}

.newsletter-form input {
  padding: 0.85rem 1rem;
  border-radius: 0.8rem;
  border: 1px solid rgba(148, 163, 184, 0.4);
  background: rgba(15, 23, 42, 0.4);
  color: #f8fafc;
}

.newsletter-form input::placeholder {
  color: rgba(226, 232, 240, 0.6);
}

.footer-note {
  border-top: 1px solid rgba(148, 163, 184, 0.2);
  margin-top: 3rem;
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.9rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 960px) {
  .hero-content {
    grid-template-columns: 1fr;
  }

  .main-nav {
    gap: 1rem;
    font-size: 0.95rem;
  }
}

@media (max-width: 640px) {
  .header-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.8rem;
  }

  .language-toggle {
    margin-left: auto;
  }

  .main-nav {
    width: 100%;
    flex-wrap: wrap;
    gap: 0.75rem;
  }

  .btn {
    width: 100%;
  }

  .facebook-feed iframe {
    height: 560px;
  }
}